7.5
HIGH
CVSS 3.1
CVE-2026-20216
ClamAV InstallShield File Format Processing Resource Exhaustion Vulnerability
Overview
Description
A vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper handling of temporary resources during file scanning. An attacker could exploit this vulnerability by submitting a crafted InstallShield file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process and temporarily consume available system resources, resulting in a DoS condition on the affected software.
Details
INFO
Published Date :
July 1, 2026, 5:16 p.m.
Last Modified :
July 9, 2026, 6:09 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
Update ClamAV to fix a denial-of-service vulnerability related to InstallShield file parsing.
- Update ClamAV to the latest version.
- Apply vendor-provided patches immediately.
- Monitor system resources after updating.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-20216.
| URL | Resource |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-20216 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-20216
weaknesses.
CAPEC-125: Flooding Flooding
CAPEC-130: Excessive Allocation Excessive Allocation
CAPEC-147: XML Ping of the Death XML Ping of the Death
CAPEC-197: Exponential Data Expansion Exponential Data Expansion
CAPEC-229: Serialized Data Parameter Blowup Serialized Data Parameter Blowup
CAPEC-230: Serialized Data with Nested Payloads Serialized Data with Nested Payloads
CAPEC-231: Oversized Serialized Data Payloads Oversized Serialized Data Payloads
CAPEC-469: HTTP DoS HTTP DoS
CAPEC-482: TCP Flood TCP Flood
CAPEC-486: UDP Flood UDP Flood
CAPEC-487: ICMP Flood ICMP Flood
CAPEC-488: HTTP Flood HTTP Flood
CAPEC-489: SSL Flood SSL Flood
CAPEC-490: Amplification Amplification
CAPEC-491: Quadratic Data Expansion Quadratic Data Expansion
CAPEC-493: SOAP Array Blowup SOAP Array Blowup
CAPEC-494: TCP Fragmentation TCP Fragmentation
CAPEC-495: UDP Fragmentation UDP Fragmentation
CAPEC-496: ICMP Fragmentation ICMP Fragmentation
CAPEC-528: XML Flood XML Flood
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-20216 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-20216 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 09, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:* versions up to (excluding) 1.29.0 *cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:* versions up to (excluding) 8.6.2 *cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:* versions up to (excluding) 1.27.2 Added CPE Configuration OR *cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:* versions up to (excluding) 1.4.5 *cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:* versions from (including) 1.5.0 up to (excluding) 1.5.3 Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 01, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-20216', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-01T17:18:03.116587Z'} -
New CVE Received by [email protected]
Jul. 01, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Cisco', 'product': 'Cisco Secure Endpoint', 'versions': [{'status': 'affected', 'version': '7.0.5'}, {'status': 'affected', 'version': '6.2.19'}, {'status': 'affected', 'version': '7.3.3'}, {'status': 'affected', 'version': '7.2.13'}, {'status': 'affected', 'version': '6.1.5'}, {'status': 'affected', 'version': '6.3.1'}, {'status': 'affected', 'version': '6.2.5'}, {'status': 'affected', 'version': '7.3.5'}, {'status': 'affected', 'version': '6.2.1'}, {'status': 'affected', 'version': '7.2.7'}, {'status': 'affected', 'version': '7.1.1'}, {'status': 'affected', 'version': '6.3.5'}, {'status': 'affected', 'version': '6.2.9'}, {'status': 'affected', 'version': '7.3.1'}, {'status': 'affected', 'version': '6.1.7'}, {'status': 'affected', 'version': '7.2.11'}, {'status': 'affected', 'version': '7.2.3'}, {'status': 'affected', 'version': '7.1.5'}, {'status': 'affected', 'version': '6.3.3'}, {'status': 'affected', 'version': '7.3.9'}, {'status': 'affected', 'version': '6.2.3'}, {'status': 'affected', 'version': '6.1.9'}, {'status': 'affected', 'version': '6.0.9'}, {'status': 'affected', 'version': '7.2.5'}, {'status': 'affected', 'version': '6.0.7'}, {'status': 'affected', 'version': '6.3.7'}, {'status': 'affected', 'version': '1.12.3'}, {'status': 'affected', 'version': '1.8.0'}, {'status': 'affected', 'version': '1.11.1'}, {'status': 'affected', 'version': '1.12.4'}, {'status': 'affected', 'version': '1.10.0'}, {'status': 'affected', 'version': '1.12.0'}, {'status': 'affected', 'version': '1.8.1'}, {'status': 'affected', 'version': '1.10.1'}, {'status': 'affected', 'version': '1.12.1'}, {'status': 'affected', 'version': '1.12.6'}, {'status': 'affected', 'version': '1.14.0'}, {'status': 'affected', 'version': '1.10.2'}, {'status': 'affected', 'version': '1.12.7'}, {'status': 'affected', 'version': '1.12.2'}, {'status': 'affected', 'version': '1.6.0'}, {'status': 'affected', 'version': '1.9.0'}, {'status': 'affected', 'version': '1.11.0'}, {'status': 'affected', 'version': '1.7.0'}, {'status': 'affected', 'version': '1.13.0'}, {'status': 'affected', 'version': '1.8.4'}, {'status': 'affected', 'version': '1.13.1'}, {'status': 'affected', 'version': '1.9.1'}, {'status': 'affected', 'version': '1.12.5'}, {'status': 'affected', 'version': '1.13.2'}, {'status': 'affected', 'version': '8.1.7.21512'}, {'status': 'affected', 'version': '8.1.7'}, {'status': 'affected', 'version': '8.1.5'}, {'status': 'affected', 'version': '8.1.3.21242'}, {'status': 'affected', 'version': '8.1.3'}, {'status': 'affected', 'version': '8.1.5.21322'}, {'status': 'affected', 'version': '8.1.7.21417'}, {'status': 'affected', 'version': '1.14.1'}, {'status': 'affected', 'version': '1.15.1'}, {'status': 'affected', 'version': '1.15.2'}, {'status': 'affected', 'version': '1.15.3'}, {'status': 'affected', 'version': '1.15.4'}, {'status': 'affected', 'version': '1.15.5'}, {'status': 'affected', 'version': '1.15.6'}, {'status': 'affected', 'version': '1.16.0'}, {'status': 'affected', 'version': '1.16.1'}, {'status': 'affected', 'version': '1.16.2'}, {'status': 'affected', 'version': '1.16.3'}, {'status': 'affected', 'version': '1.18.0'}, {'status': 'affected', 'version': '1.18.1'}, {'status': 'affected', 'version': '1.20.0'}, {'status': 'affected', 'version': '1.21.0'}, {'status': 'affected', 'version': '1.21.1'}, {'status': 'affected', 'version': '1.21.2'}, {'status': 'affected', 'version': '1.21.3'}, {'status': 'affected', 'version': '1.22.0'}, {'status': 'affected', 'version': '1.22.1'}, {'status': 'affected', 'version': '1.22.2'}, {'status': 'affected', 'version': '1.22.3'}, {'status': 'affected', 'version': '1.22.4'}, {'status': 'affected', 'version': '1.24.0'}, {'status': 'affected', 'version': '1.24.1'}, {'status': 'affected', 'version': '1.24.2'}, {'status': 'affected', 'version': '1.24.3'}, {'status': 'affected', 'version': '1.24.4'}, {'status': 'affected', 'version': '1.26.0'}, {'status': 'affected', 'version': '1.24.5'}, {'status': 'affected', 'version': '1.26.1'}, {'status': 'affected', 'version': '1.27.0'}, {'status': 'affected', 'version': '1.15.0'}, {'status': 'affected', 'version': '1.17.0'}, {'status': 'affected', 'version': '1.17.1'}, {'status': 'affected', 'version': '1.17.2'}, {'status': 'affected', 'version': '1.19.0'}, {'status': 'affected', 'version': '1.20.1'}, {'status': 'affected', 'version': '1.20.2'}, {'status': 'affected', 'version': '1.20.3'}, {'status': 'affected', 'version': '1.20.4'}, {'status': 'affected', 'version': '1.20.5'}, {'status': 'affected', 'version': '1.20.6'}, {'status': 'affected', 'version': '1.23.0'}, {'status': 'affected', 'version': '1.23.1'}, {'status': 'affected', 'version': '1.20.7'}, {'status': 'affected', 'version': '1.20.8'}, {'status': 'affected', 'version': '1.25.0'}, {'status': 'affected', 'version': '1.25.1'}, {'status': 'affected', 'version': '1.25.2'}, {'status': 'affected', 'version': '1.27.1'}, {'status': 'affected', 'version': '1.27.2'}, {'status': 'affected', 'version': '7.3.13'}, {'status': 'affected', 'version': '7.3.15'}, {'status': 'affected', 'version': '7.4.1'}, {'status': 'affected', 'version': '7.4.1.20425'}, {'status': 'affected', 'version': '7.4.1.20439'}, {'status': 'affected', 'version': '7.4.3'}, {'status': 'affected', 'version': '7.4.3.20679'}, {'status': 'affected', 'version': '7.4.5'}, {'status': 'affected', 'version': '7.5.1.20813'}, {'status': 'affected', 'version': '7.5.1.20833'}, {'status': 'affected', 'version': '7.5.3'}, {'status': 'affected', 'version': '7.5.5'}, {'status': 'affected', 'version': '8.0.1.21160'}, {'status': 'affected', 'version': '8.0.1.21164'}, {'status': 'affected', 'version': '7.5.7'}, {'status': 'affected', 'version': '7.5.9'}, {'status': 'affected', 'version': '7.5.11'}, {'status': 'affected', 'version': '8.1.7.21585'}, {'status': 'affected', 'version': '7.5.13.21586'}, {'status': 'affected', 'version': '7.5.13.21598'}, {'status': 'affected', 'version': '8.2.1.21612'}, {'status': 'affected', 'version': '8.2.1.21650'}, {'status': 'affected', 'version': '7.5.15.21611'}, {'status': 'affected', 'version': '7.5.17.21680'}, {'status': 'affected', 'version': '8.2.3.30119'}, {'status': 'affected', 'version': '8.2.4.30130'}, {'status': 'affected', 'version': '8.4.0'}, {'status': 'affected', 'version': '7.5.19'}, {'status': 'affected', 'version': '8.4.1.30298'}, {'status': 'affected', 'version': '8.4.2.30317'}, {'status': 'affected', 'version': '8.4.1.30307'}, {'status': 'affected', 'version': '7.5.20'}, {'status': 'affected', 'version': '8.4.3'}, {'status': 'affected', 'version': '8.4.4.30419'}, {'status': 'affected', 'version': '8.4.4.30467'}, {'status': 'affected', 'version': '7.5.21.21732'}, {'status': 'affected', 'version': '8.4.5.30483'}], 'defaultStatus': 'unknown'}] Added Description A vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper handling of temporary resources during file scanning. An attacker could exploit this vulnerability by submitting a crafted InstallShield file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process and temporarily consume available system resources, resulting in a DoS condition on the affected software. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.